1366 - Incorrect integer value: '' for column `pella-ware`.`whos_online`.`customer_id` at row 1

insert into whos_online (customer_id, full_name, session_id, ip_address, time_entry, time_last_click, last_page_url) values ('', 'Guest', '1fd2c6b6c65dd50c29215b7901458450', '216.73.216.61', '1772347341', '1772347341', '/')

[XT SQL Error]